People gather at an election rally in the Papua New Guinea capital, Port Moresby ahead of the 2017 elections.
Photograph: Eric Tlozek/AP

Democracy in last year’s Papua New Guinea national election was “hijacked” in many places, with the vote undermined by brazen electoral fraud and unprecedented violence and insecurity, a damning analysis of the 2017 vote has found.

“The 2017 elections were marred by widespread fraud and malpractice, and extensive vote rigging,” Nicole Haley, associate professor at ANU and the lead author of the study, told a recent gathering of Pacific scholars in Canberra.

The findings, to be published early next year, are based on records collected by 258 election observers at 945 polling stations around the country. Many voters were denied genuine choice through block voting, coerced collective voting, violence, intimidation and pre-marked ballot papers in many locations.

One third of citizens surveyed reported intimidation, one quarter reported that they did not vote – significantly higher rates than in 2012. Less than half reported they voted freely.

Women fared the worst. Only two in five women reported voting freely, with about the same number reporting intimidation. Not a single woman was elected in 2017 to the 111-member parliament.

As an example, she cited the case of Koroba in the highlands, where in 2012, she photographed women voting in a relaxed environment. In 2017, the voting area was occupied by men, while women and children looking in from behind a spiked fence.

“The crowd eventually became quite rowdy, tried to push over the fence, objecting that their ballots were being cast for them by other people,” Dr Haley said. Security forces responded by “driving their vehicles at high speed into the crowd to disperse the crowd … for me, that shows the quite different nature of this election”.

Haley’s team, which included Australian and PNG academics, recorded 204 deaths during the election period – twice as many as were claimed in the 2002 national election, which is often cited as PNG’s worst election. In that poll, the election officially failed in six electorates due to widespread violence and fraud.

“In addition to those [deaths], several hundred people were seriously injured or maimed,” Dr Haley said. “Lots of cases of people having limbs severed, people being chopped [with machetes] across the country, major property damage as well.” Of the 43 electorates scrutinised by observers, there were only six in which there was no death or major property damage.

The Western Highlands village of Wapena was attacked by a neighbouring tribe during the 2017 Papua New Guinea national election, leading to more than 35 homes being destroyed. Photograph: Helen Davidson for the Guardian

ANU academic and Papua New Guinea election specialist, Bill Standish, said that when foreign observers turn up at polling stations, people tend to be on their best behaviour and that dirty tactics had spread since 1992.

“Efforts towards free and fair elections have been swept aside by the control which MPs exert over local officials and even police,” he said. “Popular democracy has been replaced by cynical manipulation by incumbents, their rivals and supporters alike. Observers’ reports, social media outrage and electoral appeals all seem to have no effect.”

Haley’s teams also reported that counting had also been compromised. “In tally rooms across the country, officials employed what observers called a bulldozer approach to counting, which meant not doing quality checks … deflecting questions and queries from scrutineers.” Prime Minister O’Neill has asked for a review of preferential voting because of the slow and costly count.

The PNG Electoral Commission and national government did not respond to The Guardian’s requests for comment.